Knife with separable blade



Sept. 15. 1925.,

G. GOLDM AN KNIFE WITH SEPARABLE BLADE Filed Jan. 17, 1925 specification.

.parts of the handle and one of these longi- P.......d s....15,1925. 1,554,083 UNITED STATES PATENT OFFICE.

GUSTAV GOLDMAN, OF BALTIMORE, MARYLAND. KNIFE WITH SEPARABLE BLADE.

Application filed January 17, 1925. Serial No. 3,159.

readily or accidentally misplaced so as to loosen the blade. VVith' these objects in view the invention consists of the construction and combination of elements hereinafter described, and-then more specifically pointed out in the claims.

In the accompanying drawings, showing one form which the inventive idea may assume Fig. 1 is a side elevation of a knife embodying the invention;

Fig. 2 is a top plan view thereof;

Fig. 3 is a side elevation of one of the handle portions showing the means of as sembling the blade with relation thereto;

i-g. 4 is a vertical transverse section on the line 44 of Fig. 1;

Fig. 5 is a 5-5 of Fig. 1. i

In said drawings, in which like refer- To all whom it may concern:

Be it known that I. GUSTAV GonnMAN, a citizen of the United States of America, and a resident of Baltimore, Maryland, have invented new and useful Improvements in Knives with Separable Blades, which invention is fully set forth in the following lllS invention relates'to knives with removable, separable on interchangeable blades designed for surgical or other uses, and is an improvement on the structure shown, describedand claimed in U. S. Pat ent 1,506,897, dated Sept. 2, 1924. The 1nterchangeable blades in knives of this character are of very thin sheets of metal and as they'are designed for uses such as surgical operations and the like. it is essential that the blades should be firmly held in post tion and absolutely restrained from any lateral or longitudinal play in the handl ence numerals indicate like parts throughportion of the knife. out the several views, 1 is the blade which In the patent mentioned above the handle is inthe form of thin sheet metal having its portion of the knife is composed of two longitudinal portionssecured together by a mortise and tenon construction, with the blade held between the two longitudinal throughout the greater portion of its length has approximately parallel sides, but which at its forward end 6 has an enlarged opening. The handle of the knife, as in the pat ent aforementioned, is composedof two longitudinal halves or members 7 and 8. The handle member 7 is slightly cut away or recessed at its forward end portion 9, to a depth equal to the thickness of the blade 1, said cut-away portion having an upwardly. and forwardly inclined shoulder 10, and projecting laterally from said cut-away tudinal portions is provided with an overanging lateral flange extending at a right angle over the top of the other portion and serving as a finger rest in the use of the 'fe and an abutment against which the top of the blade reacts when cutting pres sure is applied to the knife. It has been found in practice that this leaves the blade free to have lateral play, particularly if the handle portion of the blade is moved to one side or the other in the cutting action. One portion is a headed pin 11. Th object of the present invention is to elim iof the forward portion of the nate this lateral play to the blade. When her 7 and extendlng approximately throughthe blade is in position between the two out the length of the cut-away or recessed handle portions it is absolutely essential portion 9, is provided with an outwardly that the blade be held with great firmness and downwardly extending bevel 12 (see while at the same time providing a construc- Fig. 4) and when the blade 1 is in position tion in which the movement, of the parts to assemble and disassemble the blade from the handle portion may be readily accomplished, and a further object of the invention is to assure such firm retention of the blade in position on the handle portion and at the same time provide handle portions' which may be manipulated with facility to assemble and disassemble the blade, but which may be retained. in assembled posi-' tion with such firmness that they cannot be slightly above the inner edge of this bevel 12, as indicated at 1 in Fig. 4. The rearward portion of the handle member 7 is provided with a laterally extending pin 13 having an oblong rectangular-shaped head 13 with its longer dimension extending transversely of the handle member 7.

The handle member 8, forming the other longitudinal half of the handle, is provided with an oblong slot 14, the rear end of which section in plan on the line e upper edgehandle mem-' the top of the blade preferably extends very posite the bevel 12 thereon,

- is then passed 'wardly extendingflange slot is approximately opposite the pin 13 on the handle member 7, when the parts are in assembled position, and .in which position the oblong head 13" of the pin 13 extends transversely of the slot 14 as clearly shown in Fig. 1.

The outer surface of the handle member 8, adjacent the pin 13, is slightly inclined, as clearly shown at 8 in Fig. 5, the handle member being thicker at the rear end of the slot 14 than at the forward end, and the thickness of said member at the rear end being such that it slides under the head 13 with close frictional engagement.

The forward portion of the handle member 8 is provided with alaterally and downs 15, which flange, on its under side immediately opposite the blade 1, may be slightly grooved to receive the upper edge portion of ,the blade, and

that ortion of the flange which overlies the hand e member 7, a d mnnediately op:

said groove outwardly and shown at 16,-Fig. 4, so are assembled the bevel ga ed by the bevel portion 16. .The forward en of the handle member 8'is provided with a forwardly opening'slot 17 having a downwardly and outwardly inclined cam surface portion 17 on-its forwardlower edge. This slot is so proportioned that when the parts are in the assembled position shown in Fig. 1, it engages the pin 11 with t e head of the pin fitting snugly against the outer surface of the handle me her 8 as'willbeclearlyunderstood. from an inspection of Fig. 4.

To assemble the'parts thehandle portion 8 is moved rearward until the slot 17 disengages from the pin 11, when the handle portion 8 may be-turned upon the pin 13 as shown in dotted lines in Fig. The enlarged opening 60f the slot 3 of the blade over the'head of the pin 11 and the blade turned until the inclined rear end portion 2 thereof meets the forwardly inclined abutment 10'on the handle memher 7. The handle member '8 is then turned downwardly, turning around the pin 13 until the flange 15 is brought down upon the top of the blade and the top of the beveled portion 12 of the handle member 7, and the handle member 8 is then moved forward until'the rear end of the slot 17 en.- gages the pin 11. The head of the pin, being slightly larger than the width of the slot, engages with the outer surface of the handle member 8. By reason of the engagement of the cam 17" with the pin 11, the flange 15 is drawn forcibly and firmly downward into engagement wit the blade 1 and by the engagfmentof the be'velexl portion 16 on said andle memberB with the beveled face 12 on the handle member 7 the two members are drawn into firm engagement with is desired to completely is beveled "from I downwardly that when said parts 12 is snugly'em.

-the invention provi both sides of the blade and retained so that the parts may the under side of the with the under side of the blade to eitherside,

pree entheir inner faces and are held in such I i I said members longitudinally with reference' to the other. It will be rea understood that, if it separate the two 8, this may be achandle members 7 and lines i i angles to the member 7 sothat the head 13 of the pin 13 will pass out ofthe slot 14.

, complished by sliding the handle member 8 i rearward t the position shown v -by"dotted Land-"then turning it at right From the foregoing it will be seen that I des a knife with a separable blade which maybe readily and quickly separated or removed therefrom, but which, nevertheless, when in position is absolutely restrained from movement either longitudinally, laterally or up and down, same time is provided with an eflicient finger rest for the forefinger when using the knife as it would be used in many surgical operations. The s herein given is' that of one embodiment of the inventive'idea, but it will be readily .recognized by those skilled in the art that the invention may assume other ific forms without departing from the hmits of the invention as such limits are defined in the appended claims.

What is claimed is 1. In a knife with separable blade, dle divided into two longitudinally extending parallel halves or portions, a blade between said portions, and two cam engagements between said portions adjacent said blade one of which imparts vertical and the other lateral clamping action to said portions.

2. In a knife with separable blade, a handle divided into two. longitudinally extenda haning parallel halves or portions one of wh chand at the ific description of the invention portion, a blade'between said nally grooved'onits under surface, a blade between said portions with its upper edge in the groove of said flange, and means forcing the upper edge of the blade into the said groove by relative longitudinal movement of said handle portions.

5. In a knife with separable blade, a hand dle divided into two longitudinally extending parallel halves or portions one of which is beveled on its upper forward edge and the other of which is provided with alateral downwardly extending flange beveled on its under surface, a blade between said portions, and a cam-acting pin and slot connection between said handle. portions forcing said beveled surfaces into cooperative relation to clamp saidblade.

6. In a knifewith separableblade, a handle divided into two longitudinally extending parallel halves or portions, pin and slot connections between said portions, a blade clamped between said portions ward ends, a flange on one portion overhanging said blade and the upper edge of the force said handle lower edge of at their fora other portion, and cooperating cam surfaces on sald upper edge and on said flange to portions into close clamping engagement with the blade.

In a knife with separable blade, a ha r dle divided into two longitudinally extending parallel halves or portions, pin and slot connections between said portions whereby they may have relative longitudinal movement, a blade clamped between the forward ends of said handle portions, a flange on the forward end of one of said portions overhanging the upper edge of the forward end a of the other portion, and cooperating cam surfaces on said portions to force them into clamping engagement.

8. In a knife withseparable blade, a hanle divided into two longitudinally extending parallel halves or tween the forward ends of said portions, a headed pin on one portion and passing through an opening in said blade and through a slot in the other portion the outer surface of which passes under and engages the head of said pin, a cam surface. on the said slot engaging sald pin, and a second headed pin near the rear end of one of the handle portions and passing through a slot in the other portion the under side of the head of said pin engaging an inclined wedge-like surface on the outer face of said last-named handle portion.

In testimony whereof I have signed this specification. GUSTAV GOLDMAN.

portions, a blade be- 

